[Help] how to make custom multisell [stack enchant] L2J

[JacoobPL]

hey. i want to ask how can i make multisell like this


if u have +++ weap for example Draco Bow +15[non sa] when u add sa at npc enchant will stay and it will be +15 Draco bow focus?
sry for my bad english.

 

[B1ggBoss]

<?xml version='1.0' encoding='utf-8'?> ----->After this line, add this one:
<list maintainEnchantment="true">